yml files have different icons

[Stanzilla]

any reason why? does the file name matter?

[Alhadis]

does the file name matter?

Yes, it does. The icon you're seeing for mkdocs.yml is being used to represent MkDocs-related files. The reason you're not seeing it for the mkdocs-prod.yml file is because that filename hasn't been registered. Are there any other filenames that should be receiving the MkDocs icon?

[Stanzilla]

Well in theory everything with mkdocs in the name then, there is no special rule on what you can or can't have in the file name which makes this a bit more complicated I guess

[alvar-osz]

Does VSCode allow something patterns like mkdocs-*.yml?

[Alhadis]

Does VSCode allow something patterns like mkdocs-*.yml?

No, it doesn't. And it's a major pain-in-the-arse.